An antioxidant sensor includes a first light source configured to emit light having a first wavelength onto an object； a second light source configured to emit light having a second wavelength onto the object； a third light source configured to emit light having a third wavelength onto the object, the first wavelength, the second wavelength, and the third wavelength being different from each other； a light receiver configured to receive light reflected or scattered from the object； and a processor configured to obtain a hemoglobin index by driving the first light source and the second light source, and to obtain an antioxidant signal of the object by driving the third light source based on the obtained hemoglobin index satisfying a condition.
